In there, you'll be able to freely draw something, which will then be rigged and animated automatically - there's even different skeletons available, but I've yet to see much of a difference, except for the type of animation.
If anyone has more time to play around with it, and finds out what the purpose of this is (there doesn't have to be one, it's neat honestly) then feel free to tell me :)
nevermind, this time, when opening I was placed into a queue, and submitted my doodle (which will probably be shown to other participants).
You are shown a wireframe-landscape populated with all kinds of doodles, made by other people (attention, due to the human nature, some of these might be slightly NSFW).
I can't really investigate this any further, since it kills my Laptop performance-wise, but it's an interesting little thing.
I have no experience with using glitch professionally and actually assume that it's not their target user.